java打印时间

打印昨天的现在时间
Oracle

select to_char(sysdate-1,'yyyy-MM-dd HH24:mi:ss') from dual

Java
Calendar   calendar=Calendar.getInstance();  
          calendar.setTime(new   Date());                            
          String   year=String.valueOf(calendar.get(Calendar.YEAR)),  
                        month=String.valueOf(calendar.get(Calendar.MONTH)+1),  
                        day=String.valueOf(calendar.get(Calendar.DAY_OF_MONTH)),  
                        week=String.valueOf(calendar.get(Calendar.DAY_OF_WEEK)-1);  
          int   hour=calendar.get(Calendar.HOUR_OF_DAY),  
                  minute=calendar.get(Calendar.MINUTE),  
                  second=calendar.get(Calendar.SECOND);  
          System.out.println("现在的时间是：");  
          System.out.println(""+year+"年"+month+"月"+day+"日   "+   "星期"+week);  
          System.out.println(""+hour+"时"+minute+"分"+second+"秒");